Re: libseed-list bug with threads and closures?

[Jonatan Liljedahl <lijon kymatica com>]

Any ideas on this? I'm stuck.. Hoping someone with more insight in 
closures and gobject-introspection might help.

/Jonatan

On 07/28/2010 04:06 PM, Jonatan Liljedahl wrote:
> This simple code crashes (output and stacktrace at the end of this
> mail). I don't see why it shouldn't work. GLib.idle_add() is the
> recommended way to defer stuff from a thread to the mainloop and I've
> used it several times in C code.
>
> Seems to be a problem with closures, threads and the garbage collector?
>
> /////////// thread_bugs.js ////////////
> var Gtk = imports.gi.Gtk;
> Gtk.init(0,0);
>
> var w = new Gtk.Window({border_width: 20});
> var b = new Gtk.Button({label: "Foo"});
> w.add(b);
> w.show_all();
>
> b.signal.clicked.connect(function() {
> print("Clicked");
> GLib.thread_create_full(function() {
> print("Thread start");
> var i=0;
> var x=1.3;
> for(i=0;i<9999999;i++) {
> x *= 1.000004;
> };
> print(x);
> print("Dispatch to mainloop");
> GLib.idle_add(GLib.PRIORITY_DEFAULT_IDLE,function() {
> print("In mainloop");
> b.label = "Bar"+x;
> return false;
> });
> },null,0,true);
> });
>
> Gtk.main();
> //////////// EOF /////////////
>
> Clicked
>
> ** (seed:2184): WARNING **: ArgumentError - probably due to incorrect
> gir file (which may be fixed upstream) argument 2 must not be null for
> function: thread_create_full
>
> [New Thread 0xb57d8b70 (LWP 2188)]
> Thread start
> 3.05975143636762e+17
> Dispatch to mainloop
> In mainloop
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x00cdbd12 in ?? () from /usr/lib/libwebkit-1.0.so.2
> (gdb) bt
> #0 0x00cdbd12 in ?? () from /usr/lib/libwebkit-1.0.so.2
> #1 0x00cdc8a4 in ?? () from /usr/lib/libwebkit-1.0.so.2
> #2 0x00cdc905 in ?? () from /usr/lib/libwebkit-1.0.so.2
> #3 0x00cdd845 in ?? () from /usr/lib/libwebkit-1.0.so.2
> #4 0x00cde4f0 in ?? () from /usr/lib/libwebkit-1.0.so.2
> #5 0x00be63b3 in JSGlobalContextRelease () from /usr/lib/libwebkit-1.0.so.2
> #6 0x00137bb6 in seed_handle_closure (cif=0x81ccc00, result=0xbfffec38,
> args=0xbfffebd0, userdata=0x81cb7e8) at seed-closure.c:290
> #7 0x003aa316 in ?? () from /usr/lib/libffi.so.5
> #8 0x003aa6fa in ?? () from /usr/lib/libffi.so.5
> #9 0x00301151 in ?? () from /lib/libglib-2.0.so.0
> #10 0x00303165 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
> #11 0x00306f88 in ?? () from /lib/libglib-2.0.so.0
> #12 0x003074c7 in g_main_loop_run () from /lib/libglib-2.0.so.0
> #13 0x0132c3c9 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
> #14 0x003aa63f in ffi_call_SYSV () from /usr/lib/libffi.so.5
> #15 0x003aa46f in ffi_call () from /usr/lib/libffi.so.5
> #16 0x0039c799 in g_function_info_invoke ()
> from /usr/lib/libgirepository-1.0.so.0
> #17 0x0013bb4a in seed_gobject_method_invoked (ctx=0xb636e098,
> function=0xb5f3be80, this_object=0xb6338ac0, argumentCount=0,
> arguments=0xbffff0d0, exception=0xbffff11c) at seed-engine.c:656
> #18 0x00be20be in ?? () from /usr/lib/libwebkit-1.0.so.2
> ---Type <return> to continue, or q <return> to quit---
> #19 0x00c28f1a in ?? () from /usr/lib/libwebkit-1.0.so.2
> #20 0x02614236 in ?? ()
> #21 0x00c3a7ce in ?? () from /usr/lib/libwebkit-1.0.so.2
> #22 0x00cf5b66 in ?? () from /usr/lib/libwebkit-1.0.so.2
> #23 0x00bdc4a9 in JSEvaluateScript () from /usr/lib/libwebkit-1.0.so.2
> #24 0x0013860c in seed_evaluate (ctx=0xb67a2e24, s=0x80579c0, this=0x0)
> at seed-api.c:279
> #25 0x08048f01 in seed_exec (filename=0xbffff64c "thread_bugs.js") at
> main.c:95
> #26 0x08049134 in main (argc=2, argv=0xbffff4c4) at main.c:161
>
> Running with --seed-debug=all says:
> ...
> Clicked
> ** Message: [INVOCATION] seed-engine.c:532: Converting arg: func (0) of
> function thread_create_full, exception is 0xbff862b4
> ** Message: [INVOCATION] seed-engine.c:532: Converting arg: data (1) of
> function thread_create_full, exception is 0xbff862b4
>
> ** (seed:2209): WARNING **: ArgumentError - probably due to incorrect
> gir file (which may be fixed upstream) argument 2 must not be null for
> function: thread_create_full
>
> ** Message: [INVOCATION] seed-engine.c:532: Converting arg: stack_size
> (2) of function thread_create_full, exception is 0xbff862b4
> ** Message: [INVOCATION] seed-engine.c:532: Converting arg: joinable (3)
> of function thread_create_full, exception is 0xbff862b4
> ** Message: [INVOCATION] seed-engine.c:532: Converting arg: bound (4) of
> function thread_create_full, exception is 0xbff862b4
> ** Message: [INVOCATION] seed-engine.c:532: Converting arg: priority (5)
> of function thread_create_full, exception is 0xbff862b4
> ** Message: [INVOCATION] seed-engine.c:655: Invoking method:
> thread_create_full with 6 'in' arguments and 0 'out' arguments
> ** Message: [IMPORTER] seed-importer.c:485:
> seed_gi_importer_get_property with GLib
> ** Message: [IMPORTER] seed-importer.c:389: Using existing namespace ref
> (0xb5bc3b40) for GLib
> ** Message: [IMPORTER] seed-importer.c:498: Result (0xb5bc3b40) from
> attempting to import GLib: [object Object]
> ** Message: [INVOCATION] seed-closure.c:63: Invoking closure of type:
> ThreadFunc
>
> Thread start
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9ef4050. with priv->free_pointer = 0 with type: Thread, size: 2863311530
> 3.05975143636762e+17
> Dispatch to mainloop
> ** Message: [INVOCATION] seed-engine.c:532: Converting arg: priority (0)
> of function idle_add, exception is 0xb509be3c
> ** Message: [INVOCATION] seed-engine.c:532: Converting arg: function (1)
> of function idle_add, exception is 0xb509be3c
> ** Message: [INVOCATION] seed-engine.c:532: Converting arg: data (2) of
> function idle_add, exception is 0xb509be3c
> ** Message: [INVOCATION] seed-engine.c:532: Converting arg: notify (3)
> of function idle_add, exception is 0xb509be3c
> ** Message: [INVOCATION] seed-engine.c:655: Invoking method: idle_add
> with 4 'in' arguments and 0 'out' arguments
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd4520. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5180. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd51b0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5400. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5460. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd54c0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd54f0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5520. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5550. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5580. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd55b0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5600. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5630. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5660. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5690. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd56f0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5720. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5780. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd57b0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5800. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5830. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5950. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5980. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd59b0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5a00. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5a30. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5a60. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5a90. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5ac0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5ac0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5af0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5af0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5b20. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5b80. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd5b20. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd6400. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd6400. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd6430. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd6430. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd6460. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd6460. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd6490. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd6490. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd64c0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd64f0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object
> 0x9dd6520. with priv->free_pointer = 0 with type: IBaseInfo, size: 0
> Segmentation fault
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